// Copyright 2004-2010 Castle Project - http://www.castleproject.org/
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

namespace Commons.Collections
{
    using System.Text;

    /// <summary>
    /// This class divides into tokens a property value.  Token
    /// separator is "," but commas into the property value are escaped
    /// using the backslash in front.
    /// </summary>
    internal class PropertiesTokenizer : StringTokenizer
    {
        /// <summary>
        /// The property delimiter used while parsing (a comma).
        /// </summary>
        internal const string DELIMITER = ",";

        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="str">A String</param>
        public PropertiesTokenizer(string str) : base(str, DELIMITER)
        {
        }


        /// <summary>
        /// Get next token.
        /// </summary>
        /// <returns>A String</returns>
        public override string NextToken()
        {
            StringBuilder buffer = new StringBuilder();

            while (HasMoreTokens())
            {
                string token = base.NextToken();
                if (token.EndsWith(@"\"))
                {
                    buffer.Append(token.Substring(0, (token.Length - 1) - (0)));
                    buffer.Append(DELIMITER);
                }
                else
                {
                    buffer.Append(token);
                    break;
                }
            }

            return buffer.ToString().Trim();
        }
    }
}